Chronic school absence.
D000041:Absenteeism; D000293:Adolescent; D004406:Dysgammaglobulinemia / Q000150:complications; D005260:Female; D006801:Humans; D017098:IgA Deficiency; D009034:Mother-Child Relations; D012141:Respiratory Tract Infections / Q000209:etiology; D012574:Schools